<template>
  <div class="goodsinfo-container">
    <!-- 小球 -->
    <transition
      @before-enter="beforeEnter"
      @enter="enter"
      @after-enter="afterEnter">
      <div class="ball" v-show="ballFlag" ref="ball"></div>
    </transition>

    <!-- 商品轮播图区域 -->
    <div class="mui-card">
      <div class="mui-card-content">
        <div class="mui-card-content-inner">
          <swiper :lunbotuList="lunbotu" :isfull="isfull"></swiper>
        </div>
      </div>
    </div>

    <!-- 商品购买区域 -->

    <div class="mui-card">
      <div class="mui-card-header">{{goodsinfo.title}}</div>
      <div class="mui-card-content">
        <div class="mui-card-content-inner">
          <p class="price">
            市场价：<del>￥{{goodsinfo.market_price}}</del>&nbsp;&nbsp;销售价：<span class="now_price">￥{{goodsinfo.sell_price}}</span>
          </p>
          <p>购买数量：<numbox @getCount="getSelectedCount" :max="goodsinfo.stock_quantity"></numbox>
          </p>
          <p>
            <mt-button type="primary" size="small">立即购买</mt-button>
            <mt-button type="danger" size="small" @click="addCar">加入购物车车</mt-button>
          </p>
        </div>
      </div>
    </div>

    <!-- 商品参数区域 -->
    <div class="mui-card">
      <div class="mui-card-header">商品参数</div>
      <div class="mui-card-content">
        <div class="mui-card-content-inner">
          <p>商品货号：{{goodsinfo.goods_no}}</p>
          <p>库存情况：{{goodsinfo.stock_quantity}}</p>
          <p>上架时间：{{goodsinfo.add_time | dateFormat}}</p>
        </div>
      </div>
      <div class="mui-card-footer">
        <mt-button type="primary" size="large" plain @click="goDesc(id)">图文介绍</mt-button>
        <mt-button type="danger" size="large" plain @click="goComment(id)">商品评论</mt-button>
      </div>
    </div>

  </div>
</template>

<script>
// 导入轮播图组件
import swiper from "../subcomponents/swiper.vue"
// 导入 数字选择框 组件
import numbox from "../subcomponents/goodsinfo_numbox.vue"
export default {
  data() {
    return {
      id: this.$route.params.id, // 将路由参数对象中的 id 挂载到 data ，方便后期调用
      lunbotu: [], //轮播图的数据
      isfull: false,
      goodsinfo: [],
      ballFlag: false,  //小球显示隐藏标识
      selectedCount:1  //默认购买数量为 1
    }
  },
  created() {
    this.getLunbotu();
    this.getGoodsInfo();
  },
  methods: {
    getLunbotu() {
      this.$http.get('api/getthumimages/' + this.id).then(result => {
        if (result.body.status === 0) {
          // 先循环轮播图数组的每一项，为 item 添加 img 属性，因为 轮播图组件中，只认识 item.img, 不认识 item.src
          result.body.message.forEach(item => {
            item.img = require('../../uploads/b' + parseInt(Math.random() * 15 + 1) + '.jpg');
          });
          this.lunbotu = result.body.message;
        }
      })
    },
    getGoodsInfo() {
      this.$http.get('api/goods/getinfo/' + this.id).then(result => {
        if (result.body.status === 0) {
          this.goodsinfo = result.body.message[0];
        }
      })
    },
    goDesc(id) {
      // 点击使用编程式导航跳转到 图文介绍页面
      this.$router.push({ name: "goodsdesc", params: { id } });
    },
    goComment(id) {
      // 点击跳转到 评论页面
      this.$router.push({ name: "goodscomment", params: { id } });

    },
    addCar() {
      this.ballFlag = !this.ballFlag
       // {id: 商品的 id,count:要购买的数量,price:商品的单价,selected:false}
       var goodsinfo = {id:this.id,count:this.selectedCount,title:this.goodsinfo.title,sell_price:this.goodsinfo.sell_price,selected:true}
       this.$store.commit("addToCar",goodsinfo);
    },
    beforeEnter(el){
      el.style.transform = "translate(0,0)";
    },
    enter(el,done){
      el.offsetWidth;

      // 获取小球的 在页面中的位置
      const ballPosition = this.$refs.ball.getBoundingClientRect();
      // 获取 徽标 在页面中的位置
      const badgePosition = document.getElementById("badge").getBoundingClientRect();

      const xDist = badgePosition.left - ballPosition.left;
      const yDist = badgePosition.top - ballPosition.top;

      el.style.transform = `translate(${xDist}px,${yDist}px)`;
      el.style.transition = "all .5s cubic-bezier(.4,-0.3,1,.68)";
      done();

    },
    afterEnter(el){
      this.ballFlag = !this.ballFlag;
    },
    getSelectedCount(count){
      this.selectedCount = count;
    }
  },
  components: {
    swiper,
    numbox
  }
}
</script>

<style lang="scss" scoped>
.goodsinfo-container {
  background-color: #eee;
  overflow: hidden;
  .now_price {
    color: red;
    font-size: 16px;
    font-weight: bold;
  }
  .mui-card-footer {
    display: block;
    button {
      margin: 15px 0px;
    }
  }
  .ball {
    width: 15px;
    height: 15px;
    background-color: red;
    position: absolute;
    border-radius: 50%;
    z-index: 99;
    top: 390px;
    left: 149px;
  }
}
</style>
